Power supply system



FIG. 1 is a front elevational view of a power supply system, showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

I claim the ornamental design for a power supply system, as shown and described. 